On a form submit, I have some dynamic fields and can't have model on the back-end as is seen in the example submit. I would like to have the fields all put into an object dynamically though. Is there a way to handle this with this direct implementation? With Web API I could just drop it in a JObject.

Will you be updating the project to support extjs5 and the latest .NET mvc?

I think this should be quite trivial. I have forked the excellent solution and just recompiled it against the latest libraries. I did not yet tried it with MVC5, but I can't imagine that there would be major problems. Using the solution with ExtJs 4 did not pose any problems.